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$386+ Cheap flights from Ontario (ONT) to Athens (ATH)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — ATH
Mar 24 — Mar 311
Tue 3/24
Tue 3/31
1 adult, Economy
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Cheap flight deals from Ontario to Athens

Cheapest flights from Ontario to Athens
Explore the most affordable flight options available from Ontario to Athens. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 22, 2026.

This United Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/216:37 pm
ONT
-
ATH
2 stops31h 03m
United Airlines
Fri 4/36:00 am
ATH
-
ONT
2 stops40h 38m
United Airlines
Deal found 2/18$570
This oojo deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/910:47 am
ONT
-
ATH
2 stops19h 03m
British Airways
Wed 11/257:50 am
ATH
-
ONT
2 stops24h 33m
British Airways
Deal found 2/17$579
This oojo deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/186:10 am
ONT
-
ATH
1 stop19h 35m
British Airways
Wed 9/212:00 pm
ATH
-
ONT
1 stop19h 28m
British Airways
Deal found 2/18$582
This United Airlines deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/195:00 am
ONT
-
ATH
2 stops19h 10m
United Airlines
Thu 9/312:35 pm
ATH
-
ONT
1 stop19h 51m
United Airlines
Deal found 2/19$590
This oojo deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1310:57 am
ONT
-
ATH
2 stops21h 08m
British Airways
Thu 10/297:30 am
ATH
-
ONT
2 stops23h 05m
British Airways
Deal found 2/17$603
This KLM deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/217:00 am
ONT
-
ATH
1 stop16h 15m
KLM
Fri 9/49:35 am
ATH
-
ONT
1 stop18h 26m
KLM
Deal found 2/18$604
This oojo deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/214:59 pm
ONT
-
ATH
2 stops23h 26m
British Airways
Wed 11/48:20 pm
ATH
-
ONT
2 stops35h 39m
British Airways
Deal found 2/20$626
This oojo deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/132:59 pm
ONT
-
ATH
2 stops20h 56m
British Airways
Tue 11/244:55 pm
ATH
-
ONT
2 stops39h 04m
British Airways
Deal found 2/18$627
This United Airlines deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/188:00 am
ONT
-
ATH
2 stops22h 35m
United Airlines
Wed 2/252:20 pm
ATH
-
ONT
2 stops18h 37m
United Airlines
Deal found 2/17$630
This oojo deal was found by Cheapflights users on 2/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/192:59 pm
ONT
-
ATH
2 stops24h 26m
British Airways
Mon 11/304:55 pm
ATH
-
ONT
2 stops39h 04m
British Airways
Deal found 2/21$635

Find flight deals from Ontario to Athens

Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Athens (ATH). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated February 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$570
(United Airlines)

One-way from

$386
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$541
Provider with most accurate pricing for Ontario-Athens Eleftherios V. flight deals.
Search Deals
Provider most trusted by Cheapflights users for Ontario-Athens Eleftherios V. flights.
Search Deals
From Ontario to Athens Eleftherios V.
Search Deals
One-way flight from Ontario to Athens Eleftherios V.
Search Deals
Highest demand for flights based on searches. 25% potential increase in price ($309 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($73 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ontario to Athens that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 22, 2026.
Use the filters below to find and compare flights from Ontario to Athens that are best for you.

Fly from

Ontario

Fly to

Athens

Route

Depart

Return

Price

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 3/21

10:56 am-6:50 pm

2 stops22h 54m

Athens Eleftherios V.

Fri 4/3

11:00 am-11:59 pm

2 stops22h 59m

$656

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 4/30

7:00 am-10:35 am

1 stop17h 35m

Athens Eleftherios V.

Wed 5/13

12:35 pm-10:30 pm

1 stop19h 55m

$684

OntarioAthens

ONT - ATH

ONTATH

Ontario

Thu 3/5

1:40 pm-12:30 am

2 stops24h 50m

Athens Eleftherios V.

Sun 3/8

11:25 am-9:18 pm

2 stops43h 53m

$685

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sat 5/16

10:59 am-2:10 am

2 stops29h 11m

Athens Eleftherios V.

Mon 5/25

8:50 pm-9:57 pm

2 stops35h 07m

$686

OntarioAthens

ONT - ATH

ONTATH

Ontario

Mon 3/16

2:39 pm-11:10 pm

2 stops23h 31m

Athens Eleftherios V.

Wed 3/25

1:30 pm-10:07 pm

2 stops41h 37m

$692

OntarioAthens

ONT - ATH

ONTATH

Ontario

Sun 4/26

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Thu 5/7

9:45 am-6:36 pm

1 stop18h 51m

$706

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 4/24

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Wed 4/29

9:45 am-6:33 pm

1 stop18h 48m

$716

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 4/24

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Thu 4/30

9:45 am-9:00 pm

1 stop21h 15m

$716

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 4/24

7:05 am-11:00 am

1 stop17h 55m

Athens Eleftherios V.

Fri 5/8

9:35 am-6:36 pm

1 stop19h 01m

$723

OntarioAthens

ONT - ATH

ONTATH

Ontario

Fri 2/27

6:37 pm-12:25 am

2 stops43h 48m

Athens Eleftherios V.

Sun 3/15

6:35 am-10:57 pm

2 stops25h 22m

$723

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 22 results
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Compare providers for flights from Ontario to Athens

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Athens in February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 starsTrust Score*2 stars
OvagoPrice Accuracy2 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Ontario-Athens flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-Athens flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-Athens flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Ontario-Athens flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-Athens flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Ontario to Athens

Have a flexible travel schedule? Discover the best time to fly to Athens from Ontario with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ontario to Athens

What is the cheapest month to book a flight from Ontario to Athens?

Currently, August is the cheapest month in which you can book a flight from Ontario to Athens (average of $420). Flying from Ontario to Athens in June is currently the most expensive (average of $646). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Athens

Get insights into the airlines that provide service to Athens. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Athens. Reviews last updated February 22, 2026.
Read reviews from past customers who have flown United Airlines from Ontario to Athens. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,341 reviews

Entertainment

7.1

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??
United Airlines
7.4
Good
9,341 reviews
United Airlines
7.4
Good
9,341 reviews

Entertainment

7.1

Comfort

7.3

Overall

7.4

Crew

8.1

Food

6.6

Boarding

7.7

Reviews

1 / 20
4.0
Okay

Thomas,Mar 2025

SFO - TPE

When I asked for an extra snack, I got an unhappy look from the stewardess. Geez, does one extra snack really affect the bottom line??

Related info for your journey

Find useful and relevant information for your journey from Ontario to Athens. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Ontario to Athens?

    Airlines like American Airlines, United Airlines, and British Airways fly from Ontario to Athens in about 17h 35m. The time it takes to get you to your destination can typically vary by up to 11h 36m. Ontario and Athens are separated by a distance of 6879 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What is the cheapest airline to fly from Ontario to Athens round-trip?

    According to our current data, United Airlines ($603), offers the cheapest pricing from Ontario to Athens. United Airlines is priced at 34% lower than the current average price of a flight leaving 3 months from now.

  • Can I find deals for flights from Ontario to Athens that include hotel bookings?

    Yes. In addition to deals on Ontario to Athens flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ontario to Athens?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ontario to Athens.

  • Can I find deals for business class flights from Ontario to Athens?

    Yes. Cheapflights offers flight deals from Ontario to Athens by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ontario to Athens?

    Currently, August is the cheapest month in which you can book a flight from Ontario to Athens (average of $420). Flying from Ontario to Athens in June is currently the most expensive (average of $646). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Athens?

Book flights to Athens if you plan to visit one of these locations
Glyfada
Piraeus
Tolo
Galaxidi

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Ontario to Athens

Discover the top airline that operate flights from Ontario to Athens. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$603Average$901FlexibilityNo cancel feeOn-time69%

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